I had forgotten how good the Blizzard designer notes usually are. This is another great example of designers sharing their thinking about MMO endgame, with reference to Pandaria. (They are also very open about where they think Cataclysm failed.)
No developer wants to hear "I want to play your game, but there’s nothing to do." For Mists, we are going out of our way to give players lots to do. We don’t want it to be overwhelming, but we do want it to be engaging. We want you to have the option of sitting down to an evening of World of Warcraft rather than running your daily dungeon in 30 minutes and then logging out. We understand we have many players (certainly the majority in fact) who can’t or aren’t interested in making huge commitments to the game every week and we hope we have structured things so that you don’t fall very far behind. The trick is to let players who want to play make some progress without leaving everyone else in the dust.
This. This is why you never bet against Blizzard.